I don’t know if it’s possible to exclude parts of an embedded page.
Obviously if you are a able to define a heading with all the content you would like to be embedded, you could only embed it.
E.g. if you want to include only the “Circular Flowcharts” from the Workbench note, create a heading with that name, put the content to be embedded inside it (even with lower level headings) and make the embed:
%md link%

%wikilink%
![[Workbench#Circular Flowcharts]]
In the example provided, I can see that you want to omit “metadata”. Maybe you can enclose it inside an Obsidian comment (%% commented text %%). It won’t be visible on the Preview of that note.
Hope this helps anyway!